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Browsing ELibrary by Title
Now showing items 13446-13465 of 21768
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(2002)The dominant occurrence of phosphate minerals in crystalline rocks is as accessory phases, most notably apatite, monazite, and xenotime. Because these minerals tend, to varying degrees, to partition U and Th into their ...
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(2001)The alkenone producing species Isochrysis galbana has been cultured at different temperatures, nutrient and light levels, to investigate effects of genetic and environmental variation on U37K'. The experiments show that: ...
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(2003)Type II porphyritic chondrules commonly contain several large (>40 μm) olivine phenocrysts; furnace-based cooling rates based on the assumption that these phenocrysts grew in a single-stage melting-cooling event yield ...
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(2001)For many years the presence of waxes in crude oils has been associated with organic matter derived from terrigenous sources. High temperature gas chromatography (HTGC) has been used to establish the ubiquitous presence of ...
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(2004)In the period of earthquake preparation, electromagnetic emissions appear over the seismic zones. In this work magma movements are considered as a possible source of ULF electromagnetic emissions over the zones with volcanic ...
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(2004)Ultra-calcic ankaramitic magmas or melt inclusions are ubiquitous in arc, ocean-island and mid-ocean ridge settings. They are primitive in character (XMg 4 0 65) and have high CaO contents (414 wt %) and CaO/Al2O3 (41 1). ...
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(2001)A fundamentally new model is proposed for the generation of heat and ultradeep fluids in the Earth's liquid core. Considering the rheological properties of the liquid core (viscosity from 103-105 to 107-109 poises), pressure ...
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(1997)A high-resolution calculation of strongly time-dependent thermal convection in the upper mantle with non-Newtonian, temperature-dependent rheology shows that, for an effective Rayleigh number of around 106, extremely fast ...
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(2002)The crystal structures and chemical compositions of two crystals of clinopyroxene (labelled K1 and K2) synthesized in the model system CaMgSi 2 O 6 -KAlSi 2 O 6 at 7 GPa, have been investigated. Quantitative analysis leads ...
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(2003)More and more evidence is being discovered in Phanerozoic collision belts of the burial of crustal rocks to previously unsuspected (and ever increasing) depths, presently on the order of 150–200 km, and of exhumation from ...
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ULTRAMAFIC ALKALINE VOLCANIC ROCKS OF THE ZHLOBIN FIELD (BELARUS): SOURCES AND EVOLUTION OF MAGMAS (2004)The variations in the isotopic and trace-element compositions of ultramafic alkaline volcanic rocks from the Zhlobin fields were investigated. Variations of isotopic and trace-element compositions of volcanic rocks were ...
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(2004)Like other massifs of the Platinum Belt in the Urals, the Kachkanar massif is composed of ultramafic rocks and younger gabbroids. The older association of dunite with olivine and magnetite clinopyroxenites is related to ...
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(1990)The lithology of the sediments (siliceous, clayey-siliceous, graywacke, and tuffogenic deposits) of the lower Drozdovskaya Formation suggests that the lavas were erupted in a deep-sea basin (tholeiite) and on its flanks ...
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(2003)We report data on the composition and crystal structure of the most K-rich (3.61 wt% K2O) natural clinopyroxene yet discovered. The studied crystal was found as a tiny inclusion in garnet from a garnet-clinopyroxene rock ...
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(2003)The diamond-bearing, ultrahigh-pressure Kokchetav Massif recrystallized at eclogite-facies conditions deep in the mantle at 180-km depth at 535 F 3 Ma, and yet new 40 Ar/ 39 Ar ages suggest that it may have been exhumed ...
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(2001)Measurements of compressional wave attenuation are presented for 30 low-porosity (φ = 0.4-8.8 per cent) oceanic basalts collected from 10 oceanic drill holes. The first laboratory measurements of shear wave attenuation in ...
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(2002)Marbles are frequently used as building stones even if they mostly show a limited durability. Thus, different marbles with different fabric types and states of preservation have been investigated in order to constrain the ...
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UNCERTAINTIES IN FACIES PROPORTION ESTIMATION I. THEORETICAL FRAMEWORK: THE DIRICHLET DISTRIBUTION (2002)To simulate geological models comprising several litho-types-or facies-we need first to estimate their proportions, which are often poorly known. The corresponding uncertainties can be modelled using a Bayesian approach ...
Now showing items 13446-13465 of 21768